Aeh,

That study was interesting as the only families that I know that I know of that are red shirting their boys are hyper achieving and way higher than average SES white people whose kids are anything but academically stunted.

The parents have realised that athletic prowess is valued far more highly by 'selective' US tertiary institutions than scholarship and want their progeny to have the advantage of a year's physical growth and maturity to give them an edge.

YMMV

Become what you are